Variability of the adiabatic parameter in monoatomic thermal and non-thermal plasmas

Miguel A. de Avillez, Gervásio J. Anela, Dieter Breitschwerdt

{\bf Context.} Numerical models of the evolution of interstellar and integalactic plasmas often assume that the adiabatic parameter $\gamma$ (the ratio of the specific heats) is constan…